Ninja Gaiden, released in Japan as and as Shadow Warriors in Europe, is an action-platform video game developed and published by Tecmo for the Nintendo Entertainment System. Its development and release coincided with the beat 'em up arcade version of the same name. It was released in December 1988 in Japan, in March 1989 in North America, and in August 1991 in Europe. It has been ported to several other platforms, including the PC Engine, the Super NES, and mobile phones. The story follows a ninja named Ryu Hayabusa as he journeys to America to avenge his murdered father. There, he learns that a person named "the Jaquio" plans to take control of the world by unleashing an ancient demon through the power contained in two statues. Featuring side-scrolling platform gameplay similar to Castlevania, players control Ryu through six "Acts" that comprise 20 levels; they encounter enemies that must be dispatched with Ryu's katana and other secondary weapons. Ninja Gaiden has an elaborate story told through anime-like cinematic cutscenes. It received extensive coverage and won several awards from video gaming magazines, while criticism focused on its high difficulty, particularly in the later levels. Director Hideo Yoshizawa named Ninja Gaiden as his most commercially successful project. The game continued to receive acclaim from print and online publications, being cited as one of the greatest video games of all time. It was novelized as part of the Worlds of Power game adaptations written by Seth Godin and Peter Lerangis. Plot Ninja Gaiden features a ninja named Ryu Hayabusa who seeks revenge for the death of his father and gradually finds himself involved in a sinister plot that threatens the entire world. The story opens with Ryu's father Ken seemingly killed in a duel by an unknown assailant. After the duel, Ryu finds a letter written by Ken which tells him to find an archeologist named Walter Smith in America. Before Ryu can find Walter, he is shot and kidnapped by a mysterious young woman; she hands him a demonic-looking statue before releasing him. Ryu then finds Walter who tells him of the demon statues he and Ken had found in the Amazon ruins. Walter tells Ryu of an evil demon named Jashin, that "SHINOBI" defeated, whose power was confined into "Light" and "Shadow" demon statues. Ryu shows Walter the "Shadow" demon statue given to him by the woman, but during their conversation,